Pump-rod for oil-well sanding.



J. F. DURHAM.

PUMP ROD FOR OIL WELL SANDING APPLICATION FILED JUNE15,1910 RENEWED AUG.19, 1912.

Patented Jan. 21, 1913.

Inventarr .7612 n 7 1 Durham witnesses.

JOHN F. DURHAM, OF MCKITTRICK, CALIFORNIA.

PUMP-ROD FOR OIL-WELL SANDING.

Patented Jan. 21, 1913.

Application filed. June 15, 1910, Serial No. 566.959. Renewed August 19, 1912. Serial No. 715,922.

To all whom it may concern:

Be it known that I, JOHN F. DURHAM, a citizen of the United'States, residing at McKittrick, county of Kern, State of California, have invented certain new and useful Improvements in Pump-Rods for Oil- VVell Sanding, of which the following is a specification.

This invention relates to pump rods, and particularly to pump rods when employed in oil wells or in other situations where the liquid being pumped carries sand or a similar substance with it.

The object of the invention is'to provide a pump rod having means for breaking up and advancing the sand so as to prevent the sand from obstructing the valves which prevent a backward flow of oil.

In the annexed drawings forming a part of the specification, Figure 1 is a vertical section through an oil well casing and showing a pump rod constructed according to my invention, certain parts being broken away. Fig. 2 is a through the casing and through the pump rod and this view is upon an enlarged scale. Fig. 3 is also upon an enlarged scale, and shows a short portion of the pump rod with one of the devices attached thereto for breaking up and raising the sand.

Referring more particularly to the parts 4 represents the well casing and 5 represents the pump rod to which valves 6 and 7 are attached as shown. Near the valves 6 and 7 and preferably aboveand below the same I provide a plurality of sandedogs 8. These dogs are in the form of small paddles which are slightly dished or cupped as shown at 9 on their upper faces. They are arranged radially and their inner ends are bifurcated so as to form cars 10, and these cars are attached by pivot bolts 10" to collars 11 which are in the form of split collars so as to form sections 12 which are secured on the rod by clamping bolts 13. The pivot bolts 10 are applied through cars 14 projecting radially from the collar sections. and between the cars 10 the inner edge of the dog forms a shoulder 15 which seats against the lower portion of the ears 14, and above thisshoulder the inner edge of each dog is cut away so as to form a beveled face 16 as shown. The purpose of this beveled face will appear more. fully hereinafter. As indicated in Fig. 1 for a considerable distance the rod 5 is provided with these sand dogs and they horizontal cross section' are arranged helically and when viewed in plan they present the arrangement shown in Fig. 2. IVhen the pump rod 5 is reciprocated to operate the valves 6 and 7 the sand dogs 8 move with the rod. In the downward movement of the rod the sand dogs fold upwardly as indicated by the dotted outline in Fig. 3 and this permits them to pass downwardly through the oil and sand without causing great resistance. When the upward movement of the rod commences the dogs fold back and swing down into a horizontal position as shown in Fig. '3, in full lines.

The purpose of the beveled face 16 will appear from inspection of the dotted outline of the dog shown in Fig. 3. On account of this bevel at this point when the dog folds upwardly a small gap 17 is formed between the inner edge of the sand dog and the ends of the ears 14 which permits the sand to fall through and prevents the sand from jamming in such a way as might pre- Eent the upward folding movement of the With this arrangement it should be understood that with each downward movement of the rod the sand dogs all fold upwardly and on the return or up stroke they fold back to a horizontal position. In this way they operate to break up clods of sand in their downward movement and in their upward -movement they push the sand up and raise it with the stream of oil which is flowing upwardly within the casing. In this manner the sand dogs operate efficiently to prevent the accumulation of sand at the valves which sand would choke the valves and prevent them operating etliciently.

TVVhat I claim is 1., A pump rod having a plurality of foldingdogs clamped thereto and adapted to fold inwardly when the pump rod moves downwardly, said'dogs being adapted to rest in an extended positiomwhen the pump rod moves upwardly.

2. A pump rod having a collar attached thereto. a lifting dog pivotally attached to said collar and having an inner edge seating against said collar, the said inner edge being so related thereto as to provide a gap between the dog and the collar when the dog is folded upwardly.

3. A pump rod having a collar secured thereto, a dog having ears at the side edges thereof, a pivot bolt for securing the cars clamping means for each of said dogs ca-v upon said collar, the said dog having a limiting shoulder upon its inner edge for abut ting against said collar, and having a limitingbeveled face affording a gap between the inner edge of the dog and the collar when the dog is folded toward the pump rod.

4. A Well sanding device comprising a pump rod having a pluralityof dogs and pable of securing them at any point along the length of the pump rod. j

5. A sanding device for Wells comprising a pump rod, a pivoted dog having limiting faces for controlling its extent of movement,

IHGELIIS.

and a clamp comprising clamping jaws i5 adapted to embrace the pump rodfor securing the dog at any point along its length, the said dog having securing lugsembracing the applied ends of the said clamping 20 In Witness that -I claim the foregoing I have hereunto subscribed my name this 9th day of June; 1910.

JOHN F. DURHAM. 

